Remi Beges / Mbed 2 deprecated telemetry_indexed_data_demo

A demonstration of the Telemetry library that sends the contents of an array over a single topic 'sin'. The array is a shifting 16-samples window on a sine function

Dependencies:   BufferedSerial mbed telemetry

main.cpp@1:22e495480269, 2016-03-09 (annotated)

Committer:
Overdrivr
Date:
Wed Mar 09 15:49:10 2016 +0000
Revision:
1:22e495480269
Parent:
0:2e15d72bfbcf 
update headers include

Who changed what in which revision?

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Overdrivr 0:2e15d72bfbcf 1 #include "mbed.h"
Overdrivr 1:22e495480269 2 #include "Telemetry.hpp"
Overdrivr 0:2e15d72bfbcf 3
Overdrivr 0:2e15d72bfbcf 4 /*
Overdrivr 0:2e15d72bfbcf 5 Example of the 'Telemetry' library, a portable communication library for embedded devices.
Overdrivr 0:2e15d72bfbcf 6
Overdrivr 0:2e15d72bfbcf 7 This code shows how you can use the powerful topic adressing of the library
Overdrivr 0:2e15d72bfbcf 8 to send complex, indexed and sparse data such as arrays, lists, etc.
Overdrivr 0:2e15d72bfbcf 9
Overdrivr 0:2e15d72bfbcf 10 You can use the Pytelemetry Command Line Interface to open plots, visualize the received data,
Overdrivr 0:2e15d72bfbcf 11 and communicate with the car.
Overdrivr 0:2e15d72bfbcf 12 See https://github.com/Overdrivr/pytelemetrycli
Overdrivr 0:2e15d72bfbcf 13 */
Overdrivr 0:2e15d72bfbcf 14
Overdrivr 0:2e15d72bfbcf 15 int main()
Overdrivr 0:2e15d72bfbcf 16 {
Overdrivr 0:2e15d72bfbcf 17 Telemetry TM(115200);
Overdrivr 0:2e15d72bfbcf 18
Overdrivr 0:2e15d72bfbcf 19 Timer refresh_timer;
Overdrivr 0:2e15d72bfbcf 20 refresh_timer.start();
Overdrivr 0:2e15d72bfbcf 21
Overdrivr 0:2e15d72bfbcf 22 // The topic under which the array is published
Overdrivr 0:2e15d72bfbcf 23 char topic [] = "sin:000";
Overdrivr 0:2e15d72bfbcf 24
Overdrivr 0:2e15d72bfbcf 25 // The sent array contains 16 elements
Overdrivr 0:2e15d72bfbcf 26 // Each element takes the value of a sine function, with a phase difference between each element
Overdrivr 0:2e15d72bfbcf 27 // In the command-line interface, the generated data will visualize as a moving sine wave
Overdrivr 0:2e15d72bfbcf 28
Overdrivr 0:2e15d72bfbcf 29 // Time for simulating sine function
Overdrivr 0:2e15d72bfbcf 30 float t = 0;
Overdrivr 0:2e15d72bfbcf 31
Overdrivr 0:2e15d72bfbcf 32 for(;;)
Overdrivr 0:2e15d72bfbcf 33 {
Overdrivr 0:2e15d72bfbcf 34 // 10 times per second
Overdrivr 0:2e15d72bfbcf 35 if(refresh_timer.read_ms() > 100)
Overdrivr 0:2e15d72bfbcf 36 {
Overdrivr 0:2e15d72bfbcf 37 refresh_timer.reset();
Overdrivr 0:2e15d72bfbcf 38
Overdrivr 0:2e15d72bfbcf 39 // Compute a 16 points window on a sine function that shifts in time
Overdrivr 0:2e15d72bfbcf 40 for(uint16_t i = 0 ; i < 16 ; i++)
Overdrivr 0:2e15d72bfbcf 41 {
Overdrivr 0:2e15d72bfbcf 42 // Compute sinus of point i
Overdrivr 0:2e15d72bfbcf 43 float s = sin(2 * 3.14159 * t + i/10.0);
Overdrivr 0:2e15d72bfbcf 44
Overdrivr 0:2e15d72bfbcf 45 // Build the topic
Overdrivr 0:2e15d72bfbcf 46 // First topic will be 'sin:0'
Overdrivr 0:2e15d72bfbcf 47 // Second topic will be 'sin:1', etc
Overdrivr 0:2e15d72bfbcf 48 sprintf(topic,"sin:%u",i);
Overdrivr 0:2e15d72bfbcf 49
Overdrivr 0:2e15d72bfbcf 50 // Publish sine value at index 'i' to topic 'sin:i'
Overdrivr 0:2e15d72bfbcf 51 TM.pub_f32(topic,s);
Overdrivr 0:2e15d72bfbcf 52 }
Overdrivr 0:2e15d72bfbcf 53
Overdrivr 0:2e15d72bfbcf 54 // Move time forward
Overdrivr 0:2e15d72bfbcf 55 t += 0.005;
Overdrivr 0:2e15d72bfbcf 56 }
Overdrivr 0:2e15d72bfbcf 57 }
Overdrivr 0:2e15d72bfbcf 58 }